Adhesive



Patented Jinn. l9

ath

No lllirawing. Application my 12, rear, aerial No. isaiev ii Claim.

(oi. rev-i2) (illiranted under the act of March 3, 1883, as

amended April 3th This application is made under the act of March 3, 1883, as amended by the act of April 30, 1928, and the invention herein described and claimed, it patented, may be manufactured and 5 used by or for the Government of the tUnited States for governmental purposes without the payment to me of any royalty thereon.

I hereby dedicate the invention herein described to the free use of the People of the United States of America to take efiect on the granting of a patent to me.

My invention relates to a new adhesive material which has certain water-resistant properties.

' In my studies of tuna oil fatty acids, and particularly alpha-eleostearic acid, the principal acid derived from tuna oil, it have found that these acids, and particularly alpha-eleostearic acid, when spread out in a thin layer, underwent a change to form an extremely sticky compound. This change, although accelerated by increased temperature and sunlight, takes place more slow- 1y even in the icebox and/or in the dark. After this change has taken place, this'sticlry compound exhibits certain water-resistant properties.

In the practice of this invention, commercial raw tung oil is saponiiled with the requisite amount of Baum sodium hydroxide and the resulting soap is broken up with a slight excess of dilute muriatic acid. The resultant mixture is heated untilthe fatty acids separate in a clear upper layer. The lower mineral acid layer is M28; 3763 (I). G. 75'?) drawn off and the remaining fatty acids washed with Warm water until free of mineral acid. The separated fatty acids can be used as such or they may be used in solution in organic solvent. They can also be used as their soluble soaps, the fatty 5 acids being liberated by the application of a secand solution of a dilute acid of sumcient strength to liberate the fatty'acids.

These tung oil fatty acids or their compounds or solutions are useful as an addition to insecticide or fungicide sprays and powders in that they will adhere to vegetative growth and will not be washed olf easily by rain. This material could be mixed with the insecticide or fungicide spray or dust, or its solution could be applied to the 15 vegetation, to be followed later by the desired dust or spray. The soap solution of the tung oil fatty acids could be applied in water solution, to be followed later by a dilute acid solution of sumcient strength to liberate the tung oil fatty acids, 20 or to be followed by the soluble salts of the heavier metals, thereby liberating the insoluble salts of the heavier metals which likewise have adhesive properties.

Having thus described my invention, what I claim for Letters Patent is- I claim:

An'aclheslve adapted for use in combination with insecticides and fungicides containing as its essential active ingredient alpha-eleostearic acid.

ROBERT S. McKINNEY. 

